Sewing machine



Jan. 11', 1938.

P. P. KESSLER SEWING MACHINE Original Filed Feb. 10, 1936 3 Sheets-Sheet1 INVENTOR. Paul P. Kessler P. P. KESSLE'R SEWING MACHINE Jan. 11, 1938.

Original Filed Feb. 10, 1936 3 Sheets-Sheet 2 R vr O y E T i m E l. O V5 mm. A K A M/v 0 M WW Du Fig.4-

Jan. 11, 1938.

P. P. KESSLER SEWING MACHINE Original Filed Feb. 10, 1936 3 Sheets-Sheet3 INVENTOR essler- BY 9 z Poul ATTORNEY.

Patented Jan. 11, 1938 UNITED STATES PATENT OFFICE SEWING MACHINE PaulP. Kessler, Chicago, 111.

Original application February 10, 1936, Serial No. 63,048. Divided andthis application May 5,

1936, Serial No. 78,051

4 Claims.

This'is-a divisional application from the original filed on February 10,1936, Serial-Number 63,048 for Sewing machine.

My invention relates to a feeding mechanism for a sewing machine. Amongthe objects of my invention are the following: To create a sewingmachine having, dual feed rollers in which each of said feed rollers isindependently and automatically adjustable regardless of the material ofdifferent thicknesses fed simultaneously to each of said feed rollers,so that said different thicknesses of material may be sewnsimultaneously together edge to edge. To supply a sewing machine soconstructed that it can be shifted from a ratchet-regulation to a clutchregulation and vice versa, thereby providing a machine adapted to createvarious sizes of stitches, and such other objects, advantages andcapabilities as will later more fully appear and which are inherentlypossessed by my invention.

While I have shown in the accompanying drawings a preferred embodmientof my invention, yet I wish it understood that the same is susceptibleof modification and change without departing from the spirit of myinvention.

Referring to the drawings, Fig. 1 is a front elevation of the sewingmachine embodying the features of my invention. .Fig. 2 is a verticalsection of my feeding mechanism. Fig. 3 is a fragmentary side elevationshowing my roller clutch mechanism. Fig. 4 is a front view showing thefeeding plate in position for edge to edge sewing. Fig. 5 is a sideelevation of my sewing machine embodying the features of my invention.Fig. 6 is a detailed view of my feeding mechanism.

In the embodiment selected to illustrate my invention the lower portionH of the frame ll] of a sewing machine houses the feeding mechanism 31which comprises the combination of a roller structure 2 I, a ratchet 35and a roller clutch mechanism 23. My roller structure 2| includes a pairof rollers 24 and 25. An adjustable center guide 26 is placed betweenthe rollers 24 and 25. My rollers 24 and are, of course, driven as oneunit but they are separately and automatically adjustable to accommodatedifferent thicknesses of cloth to be fed by the rollers for the sewingoperation. Each of my rollers 24 and 25 has a hollow portion 21 adaptedto receive a ball shaped bearing 28. Each of said rollers has itshollowed out portion 21 extended to form a pair of oppositely disposedgrooves 29 to receive a pair of oppositely disposed driving pins 30 ofthe ball shaped bearing 28. It will be noted that in operation when apiece of goods having a certain thickness is to be sewed to anotherpiece of a different thickness and said pieces are placed edge to edgeon my feeding mechanism each of my two feed rollers will automaticallyand separately yield on their respective ball shaped bearings tocompensate for the different thicknesses of the material. For example,when a thick piece of goods is to be sewed to a thin piece of goods sothat the thin piece of goods isfed by one roller and the-thick piece ofgoods is fed by the other roller, one roller will apply pressure to thethin piece of goods separately from the other roller 'which will move onits bearing to accommodate the thick piece of goods so that both piecesare accommodated and receive substantiallythe same feed pressure duringthe sewing operation. With my device there is even feeding regardless ofdifferent thicknesses of goods fed to either of the two rollers. Myrollers 24 and 25 furthermore are movable together against the action ofsprings 82, so as to accommodate different thicknesses of material to besewed.

My invention also comprises two distinct stitch controls, one is astitching regulator by ratchet movement and the other is a stitchregulator by clutch control. My machine is so constructed that I canshift from the ratchet regulator to the clutch regulator and vice versa,thereby providing a machine adapted to create various sizes of stitches.

An eccentric 32 is mounted on the upper portion l2 of the frame I 0 andhas an arm 61 extending downwardly which is pivoted to a ratchetconnection 33 which passes through the lower bed II and in turn ispivoted to a ratchet member 34 for operative engagement with a ratchetwheel 35 of the feeding mechanism 31. The arm 61 at its lower end isprovided with a screw 39 which is adjustably secured within a slot 38 inthe ratchet connection 33. Said member 39 may be set within slot 38 atcertain desired positions for shortening and lengthening the stitch.Actuated by an eccentric on the drive shaft supported on the upperportion I2 is a member 40 which is connected to a different adjustableconnection 4| which contacts and actuates a clutch roller 23 attached tothe roller mechanism 2|. With my roller clutch 23 the operator mayobtain any desired length of stitch at his discretion,

within the limits of adjustment of set screw 86 within slot 81.

When the ratchet mechanism is used there are three separate and distinctsizes of stitches, each one of which may be chosen by the operator. Whenthe screw 39 is in the outermost position in smallest up to a maximumpoint depending upon the adjustment of the adjustable connection 4L Thereverse operation is obvious. The ratchet mechanism is disconnected bymanually turning a lever 90 attached to the lower bed H adjacentratchet-arm 34 so that lever 90 moves said ratchet arm 34 to a positionout of engagement with ratchet wheel 35. When lever 90 is moved backspring .91 pulls ratchet arm 34 back to normal position so that itengages ratchet wheel 35 for operation.

The roller clutch mechanism may be made inoperative by the user bypositioning the set screw 86 in the lowermost part of slot 81, whichplaces it in dead center so that the driving mechanism 88 does notoperate. 7

Having thus described my invention, I claim:

1. In a sewing machine a pair of feed rollers, each of said feed rollershaving a hollow portion, and a pair of oppositely disposed grooves, aball shaped bearing, having a pair of oppositely disposed driving pins,said bearing and said pins adapted to fit into the hollow portion andgrooves of said rollers, said rollers being driven as a unit and each ofsaid rollers adapted to yield on its bearing automatically andindependently from the other roller to accommodate material of adifierent thickness than that fed simultaneous- 1y to the other roller.

2. A feeding mechanism for sewing machines comprising a pair of flexiblyconnected and independently yieldable feed rollers rotatably journaledin vertically movable supports, and yieldable means operatively engagedwith said supports.

. 3. A feeding mechanism for a sewing machine comprising rotary drivemeans, a feed roller driven by and having a universal connection withsaid drive means, and a second feed roller driven by said first rollerand having a universal connection therewith.

4. In a sewing machine, a roller feed member,

a ratchet wheel and roller clutch operatively connected with the rollerfeed member, a drive shaft, a pawl for actuating said ratchet wheel,adjustable means driven by said drive shaft and operatively connectedwith said pawl, drive connections between said drive shaft and saidroller clutch, means for throwing said pawl into and out of drivingengagement with said ratchet Wheel and means for throwing said driveconnections into and out of driving connections with said roller clutch,said roller feed member advancing the fabric for predetermined length ofstitches when operated by said ratchet wheel and pawl mechanism andadvancing the fabric for lengths of stitches intermediate saidpredetermined lengths when operated by said roller clutch.

PAUL P. KESSLER.

